Air-cooled internal-combustion engine used on motor-bicycles.



E. SIDWELL; V AIR. COOLED INTERNAL COMBUSTION ENGINE USED ON MOTORBIGYGLES.

APPLICATION FILED APB..25,1913.

Patented Apr. '7', 1914 VENTOR H M m T n magma W/T/VESSES za fiifi 1iERNEST SIDWELL, F COVENTRY, ENGLAND.

sin-costar) INTERNAL-COMBUSTION interns ns'nn on .MOTOB-BICYCLES.

pecification of Letters Eatent.

Patented Apr. "3, 1914.

Application filed April 25, 1513. Serial No. T643339.

To alZ whom it may concern Be it known that I, E'nsns'r subject of theKing of Great Britain, residing at Coventry, in the county of YVMWlClK,England, have invented certain new and useful Improvements in orRelating to run Cooled lntemail-Combustion Engines U ed onMotor-Bicycles and the like, of which the i'cllo'win' is aspecification.

This invention relates to air-cooled internal combustion engines used onmotor cycles and the like having cylinders proridedwith 1 radiating ribsor tins and ithas for its object to provide improved means for coolingthe cylinders and for shieldingthe hot parts.

Hitherto it has been proposed to surround the cylinder with wire coils,and according to I this inventionsuch coils are used, being speciallyshaped to liebetween andotherwise engage theradiating ribs, and yetproject sin ciently far all around the cylinder or cylinders to shieldthe user. Thus these coils may serve as a trouser guard easily applicable to existing engines. Each coil may be continuous, beingexpanded when being put into place and being retainedby itsspringy-naturc,-but in some cases it is not possible to completelysurround the cylinder owing to the presence of pipes or other irregularparts of the c;\'lin'der "all. in

such cases each coil may contain a spring bow of the required lengthwhich will contract the coil and causeit to remain firmly in position.

In the accompanying drawings, l igure l is a central-vertical section ofpart of the cylinder of an air cooledinternal combus- 1 tionengineshowing two differently shaped coils, Fig. 2 is a similar Viewshowing a modification. Fig. 3 is a plan view of a Cylinder to which oneof the constructions shown in Fig. 1 has been applied. Fig. i is similarView showing the application of the invention to a multi-cylindcrinternal coinbustion engine. Fig 5 is a plan View or a modification.Fig. 6 is a transverse view of the upper coil shown in Fig. 1. Fig. 7 isa plan View of the same. Fig. 8 is a View corresponding to Fig.

the same.

Like letters indicate like parts throughout the drawings. The sprin gcoils are in most cases confii-uous, consisting of wire of suitableseci-i l Wound upon a mandrel to torm a coil SLDWELL. a

6 of the coi'istruction shown in Fig. 2, and Fig. 9 is a plan View of lof suitable transverse shape and length. The ends or the coil areininost cases connected together-{the length beingsuch that th 11 i hasto be extended so as to spring around the lCylllltltl as shown'm Fig. 3,the natural spring or the co l causing it to contract and in Figs. 1 and2. If desired the coil is slightly tapered in one direction as shown inFig. 6 so as the better to wedge in between the finsfand one side of thecoil 'may be enlarged as shown in the lower part of Fig. 1. "Usuallytlie'ends of the coil are permanently lined together, but the attachmentmaybe separated and rc-joined when required. For

able length to go around the whole casting. If desired the coil may bearranged to slip upon each {in as shown inFig's. 2, 8 and 9, instead ofw'edgiug between the finsi VJhen the construction of the cylinder issuch that a c'oi'nplete coil encircling it cannot be used a shortc'oilas shown at A in Fig. 5 may be used, this being caused to grip thetaching the ends to suitable piping so as to shield the engine on oneside. By the present invention protection is a tlorded all around thecylinder and no special attachments have to be made.

Also the coils are continuous and .are applicable to engines ofdifferent sizes without any alteration. v

What I claim as my invention, and desire to secure by Letters Patent, is2- 1. In combination, the cylinder of an aircooled internal combust ionengine, ribs on said cylinder, a spring coil engaging said ribs andsurrounding said cylinder, and projecting sufficiently far to act as ashield substantially as set forth,

wedge in between the radiating fins as shownv a large cylinder, or amulti-cylinder castingas shown in Fig; at, the coil is made ofsuitcylinder by the employment of a spring bow coiled wire along oneside of the engine, at.

such that the ends of the coil can be easily ng the riders legs from i2. In combination the cylinder of an aircooled internal. combustionengine, ribs on. said cylinder, :1 spring coil engaging said ribs, and:i spring bow contained within said coil and adapted ro grip saidcylinder substantially as set forth.

- 3. In combination, the cylinder of an aircooled internal combustionengine, i'ihs on said cylinder, an endless spring coil of taper 10cross-section engaging said ribs and surrounding said cylindeijaiidpi'ojeiing snfiiciently far in act a; a shield substantially as setforth. Y i 1 w In 'testiinony wlicl eof I'have signed my name to thisspecification in tlie n csenc of two subscribing n'ii'nesses. j

' ERNEST SIDWELL.

